arch/arm/mach-ixp4xx/ixdp425-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/ixdp425-pci.c
   3  *
   4  * IXDP425 board-level PCI initialization
   5  *
   6  * Copyright (C) 2002 Intel Corporation.
   7  * Copyright (C) 2003-2004 MontaVista Software, Inc.
   8  *
   9  * Maintainer: Deepak Saxena <dsaxena@plexity.net>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/config.h>
  19 #include <linux/pci.h>
  20 #include <linux/init.h>
  21 #include <linux/delay.h>
  22
  23 #include <asm/mach/pci.h>
  24 #include <asm/irq.h>
  25 #include <asm/hardware.h>
  26 #include <asm/mach-types.h>
  27
  28 void __init ixdp425_pci_preinit(void)
  29 {
  30         set_irq_type(IRQ_IXDP425_PCI_INTA, IRQT_LOW);
  31         set_irq_type(IRQ_IXDP425_PCI_INTB, IRQT_LOW);
  32         set_irq_type(IRQ_IXDP425_PCI_INTC, IRQT_LOW);
  33         set_irq_type(IRQ_IXDP425_PCI_INTD, IRQT_LOW);
  34
  35         gpio_line_isr_clear(IXDP425_PCI_INTA_PIN);
  36         gpio_line_isr_clear(IXDP425_PCI_INTB_PIN);
  37         gpio_line_isr_clear(IXDP425_PCI_INTC_PIN);
  38         gpio_line_isr_clear(IXDP425_PCI_INTD_PIN);
  39
  40         ixp4xx_pci_preinit();
  41 }
  42
  43 static int __init ixdp425_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  44 {
  45         static int pci_irq_table[IXDP425_PCI_IRQ_LINES] = {
  46                 IRQ_IXDP425_PCI_INTA,
  47                 IRQ_IXDP425_PCI_INTB,
  48                 IRQ_IXDP425_PCI_INTC,
  49                 IRQ_IXDP425_PCI_INTD
  50         };
  51
  52         int irq = -1;
  53
  54         if (slot >= 1 && slot <= IXDP425_PCI_MAX_DEV &&
  55                 pin >= 1 && pin <= IXDP425_PCI_IRQ_LINES) {
  56                 irq = pci_irq_table[(slot + pin - 2) % 4];
  57         }
  58
  59         return irq;
  60 }
  61
  62 struct hw_pci ixdp425_pci __initdata = {
  63         .nr_controllers = 1,
  64         .preinit        = ixdp425_pci_preinit,
  65         .swizzle        = pci_std_swizzle,
  66         .setup          = ixp4xx_setup,
  67         .scan           = ixp4xx_scan_bus,
  68         .map_irq        = ixdp425_map_irq,
  69 };
  70
  71 int __init ixdp425_pci_init(void)
  72 {
  73         if (machine_is_ixdp425() || machine_is_ixcdp1100() ||
  74                         machine_is_avila() || machine_is_ixdp465())
  75                 pci_common_init(&ixdp425_pci);
  76         return 0;
  77 }
  78
  79 subsys_initcall(ixdp425_pci_init);
  80